undocumented immigrants, including those who are facing charges in this country. but on mexico paying for the wall, tonight swift reaction from the mexican president, and will he now cancel a planned visit? abc s cecilia vega at the white house. reporter: president trump today at the department of homeland security signing those executive orders on immigration. we ve been talking about this right from the beginning. reporter: the move coming after that signature campaign promise. build that wall! build that wall! reporter: in addition to building that wall, the president also vowing today to strip federal funding from so-called sanctuary cities that shield undocumented immigrants. triple the number of ice agents. and add thousands more border patrol agents. beginning today, the united states of america gets back control of its borders, gets back its borders. [ applause ] reporter: no specifics on how to pay for that wall. but president trump putting on notice millions of